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What can I use for buffing?
Damn, are you sure the glass isn't scratched? Maybe the previous residents used a scourer or an abrasive cleaner on the glass and the surface is damaged? Then it's unlikely any cleaning product will work. Maybe try a buffer and glass polishing compound.
oven cleaner, covered with clign film and left for 2 hours. then a fabric scouring pad.
a glass cleaning blade wouldnt hurt either.
That's a really generous offer. But I am in capetown@joker08 if you’re residing in GP , I got a product for you to try.
making my way to Sandton today, let me know if you can meet up, I’ll bring it a long

link for such a product, or at least the name please ?Perhaps after all this cleaning, the glass is clean, test your eyes or check your glasses?
Try a limescale remover using layers tissue towel to keep it wet and on the glass.
will buy this and see if this works.Try Chemico.
It's almost like a rubbing compound.
Thats some high end stuff!
I also read this online somewhere. unfortunately, I only got 1200 grit paper from builders which was scratching the glass. I will find out if there are any car paint shops near me.My doors looked exactly the same as yours and I also tried everything. Eventually I went to an automotive paint shop and got some 3000 grit wet or dry paper and some glass polish.
I took the glass out so that it was easier to work on. I first gave them a good scrubbing with handy andy. I then started sanding them with the paper using the shower cleaner as the lubricant. I sanded in small circles until the scale was off and you could feel the smooth glass through the paper. I did it in two or three light passes with a thorough cleaning in between.
The glass only had light scratches on, I really had expected worse, which I then polished out. I used the car polisher and was very pleased with the result, if you were to get a finer grit then there might be less polishing to do.
It was much easier and faster with less struggle than any of the chemical "solutions" I had unsuccessfully tried.